Prestone Command DEF (Diesel Exhaust Fluid) is a liquid reducing agent developed for use in all diesel engines that are equipped with a Selective Catalytic Reduction (SCR) system.

Prestone Command diesel exhaust fluid (DEF) is a colorless, odorless, nontoxic and nonflammable liquid solution consisting of 67.5% demineralized water and 32.5% high-quality automotive-grade urea. It ...

LAS VEGAS -- Prestone unveiled a new line of heavy-duty antifreeze coolants and diesel exhaust fluid Tuesday during Heavy Duty Aftermarket Week, branded Prestone Command. "Prestone has a new owner ...

Prestone Offers Command Testing Kit for Coolant, DEF. December 3, 2014 • Prestone Products Corp. • Bookmark + Prestone Products Corp. announced it has heavy-duty test kits, test strips and a ...